Furnace.



W. l. A. MUIRHEAD. FURNACE.

APPLICATION FILED ocT. 22. A1914.

Fig. 1.

WWI-J f Wiliam JA. Muirhead v By . ATTORNEY WILLIAM J; a. Murmeltier, en SEATTLE, wasHrlrfef'ilorr.l

FURNACE.

To ali whom t may concern:

l HEAD, a citizen of the United States, residing at Seattle, in the county of King and State of'Washington, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

This invention. relates vto furnaces, and comprises the novel construction and combinations of parts which are shown in the drawings, and will be hereinafter'described and claimed.

The object of my improvements is to furnish novable' floor and wing members of a furnace to supplement or be used instead of the ordinary grate bars and enable fine coal, such as screenings 7 or steam coal to be economically used as a fuel. Said members are provided with passages through which .atmospheric air, or steam, may be delivered -into the furnace, selectlvely, elther above or through the fuel-body therein to provide most advantageously the necessary chemlcal conditions for perfect combustion ;-that is to say, the roper supply of oxygen for the carbon and ydrogen of the fuel and the intermixture' of these gaseous products` to afford a substantially complete combustion.

In th/ drawings, I have shown my invention in its preferred form.

Figure 1 .is a view `1n longitudinah sectionshowing the present invention applied in a boiler-furnace. IFig. 2 is a plan view of the invention, a part being broken away and shown in section. Fig. 3 'is a detail transverse section through two members of my improved furnace bed.

In carrying out my invention, I provide a number of auxiliary horizontal floor or bed members 1 and wing members 2, which 'may be supported upon the usual furnace grate 3, as shown in Fig. 1. The members 1 are laid side by side upon the grate, and are of lengths to extend from the bridge-wall l to within a short distance of the front wall 5' of the furnace. The wing members 2 are placed at the sides of the furnace, and extend above the level of the upper surfaces of the members 1. Between the members 1 and the front wall 5 of the furnace I provide a dumping member 6 which is constituted of a bar or plate extending transversely across the furnace and supported by a rod 7 which is ljournaled in the wing members 2.' A crank-arm, or handle, 8 may be employed at an I end of rod 7 for tilting the dumping .Specication of Letters Patent. Patented Sept, '28, 1915 Application 'led October 22, 1914 v' Serial' No. 897,981. l I ,l i

below the'sill element 9 ofthe furnaceedoor opening 10.

l member. The top surface of this dumping l Be it known that I, WILLIAM J. A. MUIR- To clean the furnace, the ashes and clinkers are raked forwardly by any suitable tool,k

onto the member 6 and thence dumped into ash-pit 11 by tilting such dumping member bv means of the crank-arm 8.

The bed-members 1- are provided with longitudinallyk arranged passages 12 extend mg from transverse passages 13 which are connected. with each other, as by nipples 14. A plurality of relatively small outlets 15 are provided at intervals in the top `of the members 1 for discharging air from the passages 12 into the furnace. These outlet openings are preferablyy reduced in size^toward their discharge ends, as shown in Fig. 3. A supply pipe 16 is connected with the passages 1? and is provided with a valve 161 to` regulate the quantity of air discharged through the various outlets 15 of the horiz ontal members 1.

In the same manner, the wing-members '2 are provided with passages 17 having discharge openings 18 located at varyingdistances above the top of the members .1. Air

is conducted to the passage 17 through sup-` ply-pipes 18, fittings 19 and nipples 20. A

valve 21 is provided to regulate the flow of supplied where required, to eect the most efficient burning of the fuel. For example, when fresh fuel is supplied'to a fire, t-he heat from the latter causes the more volatile gases to be first driven therefrom into the space above the fire to be but incompletely burned unless a supply of oxygen is available to combine therewith; If air is delivered to such space through the re, it has a tendency to cool the fire or, what is worse,

to unite with the coal gases in the fire and bev burnt therewith, instead of above the fire to there combine with the gases driven of from the fuel andl prevent the escape of unl combusted gases through the stack.

The prop'er Way to insure the mostl effi cient-burning of the gases above the fire is by rst supplying air or steam thereat, and v after the gas is consumed air should beadmitted into the fire from below to burn the residual coke or other. combustible elements.y

Vliat I claim as my invention=1sv In a furnace, the combination of two side members having aii'passages communicating with air inletand outletfopenings, a `plurali-ty of parallel bed members arranged between the/side kmembers-and being substantially rectangular in cioss-sectiomeachfof said bod iiieiiibei's having f an air passage-- way and further provided with alined transverse openings communicating with said air passage-ways, air distributing outlets in the side and bed members communicatinp, with the said passage-ways, a nipple connection between -tlie adjacent transverse openings of the bed members, and fluid supply means connected to said bed members.

Signed at Seattle, Wash., this 5th day of 25 

